AVG Free users - help please.....

I'm so frustrated!!! Given my problems installing AvastHome I thought I'd try AVG - now when I install I get
AVG has caused and invalid page fauly at kernel32.dll
It says if problem persists to contact the vendor - as a fix or advice might be avaliable. However, I can't do this because to contact tech support you have to have installed a commercial version. Even the Free Forums is out of bounds as it requires you click a link once AVG installed.....
Re the fault I am checking file allocation tables, system files, registry, virus/trojan infection cannot so far find anything to account for the error.